Answer:
a. 4Cu + O₂ → 2Cu₂O
b. 266g Cu
c. 102g Cu₂O
Explanation:
Based on the balanced reaction:
a. 4Cu + O₂ → 2Cu₂O
4 moles of Cu reacts per mole of oxygen to produce 2 moles of Cu₂O.
b. To solve this question we need to find the moles of Cu₂O. With these moles and the balanced reaction we can find the moles of Cu and its mass:
Moles Cu₂O -Molar mass: 143.09g/mol-
300g Cu₂O * (1mol / 143.09g) = 2.097 moles Cu₂O
Moles Cu:
2.097 moles Cu₂O * (4mol Cu / 2mol Cu₂O) 4.193 moles Cu
Mass Cu - Molar mass: 63.546g/mol-
4.193 moles Cu * (63.546g / mol) = 266g Cu
c. In the same way, using PV = nRT we can find the moles of Oxygen. With the moles of oxygen we can find the moles of Cu₂O and its mass:
n = PV / RT
P = 1atm at STP, V = 8.0L, R = 0.082atmL/molK, T = 273.15K at STP:
n = 1atm*8.0L / 0.082atmL/molK*273.15K
n = 0.357 moles O₂
Moles Cu₂O:
0.357 moles O₂ * (2mol Cu₂O / 1mol O₂) = 0.714 moles Cu₂O
Mass Cu₂O -Molar mass: 143.09g/mol-
0.714 moles Cu₂O * (143.09g/mol) =
102g Cu₂O
classify the following energy sources as renewable and non-renewable energy sources (natural gas cool biomass and geothermal energy)
Answer:
bio mass is renewable
natural gas non renewable geothermal energy renewable
Explanation:
biomass is by palnts and animals geothermals is unlimeted because its made out of the earths core
can someone please help me with this
Answer:
36.4cm2
Explanation:
go follow my meme page on Insta gram please I just started it
Username is shawty.tedo
Also I hope you have a wonderful day today and get all your work done. I am proud of you!! you have made it through the week and even though school is going back in session for tons of us tomorrow. summer break is almost here!
Just keep pushing yourself you’re almost there! but remember don’t be harsh on yourself and take your time. Take care of yourself and make sure that you’re there for yourself too just like you’re there for others. YOU matter! no matter what you think. we will all get through hard times and it doesn’t matter if it takes years, months, weeks, days, once again it doesn’t matter because You will get through it and you’ll be so proud of yourself just like I am. Don’t give up now. if others try put you down show them that you’re unbreakable and that you’re more worth then they think. Harsh words don’t define your worth. you’re amazing and you are you. you being different from others but that doesn’t mean you’re any less important. you are you and that’s what makes you so unique. Im proud of you Keep going And spread the love
Answer:
Yes I shall follow :)
Explanation:
Thank you, I hope your meme page blows up (with followers :)
Explain why the atomic number is called the fingerprint of element
Answer:
No element shares the same atomic number. The atomic number of every element is unique to itself, just like a fingerprint is unique to a human. The atomic number of element allows us to identify it, like how we can identify a person from their fingerprint.
Explanation:
how are fossils discovered
Which of the following is a method for measuring energy in food?
A. reading the label
B. filtration
C. chromatography
D. calorimetry
Which general formula represents the homologous series of hydrocarbons that includes the compound
2-heptyne?
(1) Cn H2n-6
(2) Cn H2n-2
(3) Cn H2n
(4) Cn H2n+2
the general formular is cnH2n-2
what type of heat is it when a handle of a saucepan get hot when it is on the stove
Answer:
A conduct heat
Explanation:
because in cooking burners on stove will conduct heat energy to the bottom of the pan sitting on top of it. From there, the pan conducts heats to it content.
Pyridine, C5H5N, is a polar organic solvent. How many carbon atoms are in 7.05 moles of pyridine? 4.24 x 1024 4.24 x 10, 24 2.12 x 1024 2.12 x 10, 24 4.24 x 1023 4.24 x 10, 23 2.12 x 1025
Answer:
2.122×10^25atoms
Explanation:
number of moles=mass/molar mass
7.05moles= mass of pyridine/79
reacting mass of pyridine=556.95
C5H5N= (12×5)+(5)+(14)=79
C5=60
to find the mass of carbon in 556.95g of pyridine we take the stoichometric ratio
60[C5] -----> 79[C5H5N]
x[C5] --------> 556.95g[C5H5N]
cross multiply
x=(60×556.95)/79
x=423g of carbon
moles=mass/molar mass
moles of carbon=423/12
moles=35.25moles of carbon
moles=number of particles/Avogadro's constant
35.25=number of particles/6.02×10^23
number of particles=2.122×10^25atoms of carbon
The number of carbon atoms present in the 7.05 moles of pyridine is equal to 2.12 ×10²⁵. Therefore, option (D) is correct.
What is Avogadro's number?Avogadro’s number can be useful to express the number of particles in 1 mole of a chemical substance. Generally, these particles can be ions, atoms, molecules, electrons, or protons, according to the type of chemical reaction.
Avogadro’s constant is experimentally found approximately equal to 6.022 × 10²³ per mole.
Given, the number of moles of the Pyridine = 7.05 mol
The molar mass of the C₅H₅N = 79 g/mol
On molecule of pyridine has carbon atoms = 5
One mole of pyridine has carbon atoms = 5 × 6.022 × 10²³
Then 7.05 moles of pyridine have carbon atoms = 7.05 ×5 × 6.022 × 10²³
= 2.12 ×10²⁵ carbon atoms
Therefore, 2.12 ×10²⁵ carbons are present in 7.05 moles of pyridine.
Learn more about Avogadro's number, here:
brainly.com/question/11907018
#SPJ2
If 500 g of iron absorbs 184,000 J of heat, what will be the change in temperature?NEED THE ANSWER AS SOON AS POSSIBLE! :)
Answer:
Is this the full question?
In order for photosynthesis to happen, plants need radiant energy and which of the
following reactants?
A
Glucose sugar and water
B
Oxygen and water
с
Carbon dioxide and water
D
Oxygen and glucose sugar
Answer:
the answer is c carbon dioxide and water
____ are pieces of information that describe the appearance of the cell's content.
I think the answer is organelles.
HELP ME PLS
What is the mass of a water molecule if the hydrogens each have one neutron and the oxygen has eight neutrons?
a. 10
b. 12
c. 16
d. 20
Answer:
H2O
=(1×2)+(8)
=20
Explanation:
We have 1 Hydrogen(H) and 8 Oxygen(O)neutrons . Following the molecule formula, H2O, which means we have 2 Hydrogen that needs to times with 1 neutron;and we have only 1 Oxygen which has 8 neutrons. So 2 (H) have to times 1 and 1(O) have to times 8.
3. Svante Arrhenius developed a definition of acids and bases
which stated...
A. acids produce OH+ ions and bases produce H ions
B. acids produce H+ ions and bases produce OH ions
C. acids and bases are the same
D. acids have a high pH and bases have a low pH
pls help
btw this a repost cuz i need help rly bad
Answer:
Explanation:
BIG OL BEAN
A gas with a volume of 250 mL at a temperature of 293K is heated to 324K. What is the new volume of the gas?
Answer:
The new volume of the gas is 276.45 mL.
Explanation:
Charles's law indicates that for a given sum of gas at constant pressure, as the temperature increases, the volume of the gas increases, and as the temperature decreases, the volume of the gas decreases.
Charles's law is a law that mathematically says that when the amount of gas and pressure are kept constant, the quotient that exists between the volume and the temperature will always have the same value:
[tex]\frac{V}{T} =k[/tex]
Analyzing an initial state 1 and a final state 2, it is satisfied:
[tex]\frac{V1}{T1} =\frac{V2}{T2}[/tex]
In this case:
V1= 250 mLT1= 293 KV2= ?T2= 324 KReplacing:
[tex]\frac{250 mL}{293 K} =\frac{V2}{324 K}[/tex]
Solving:
[tex]V2=324 K*\frac{250 mL}{293 K}[/tex]
V2= 276.45 mL
The new volume of the gas is 276.45 mL.
True or false - Evaporating, condensing, melting and freezing are all examples of chemical change.
Answer:
false
Explanation:
Because these examples are able to turn back into their original form. For example, melted ice can refreeze.
Plz Answer this if you Answer this right you will get brainliest
Don't Answer this question if you don't know you will be reported
Reaction 1 :-
AlZn²⁺Zn²⁺AlReaction 2 :-
LiAl³⁺Al³⁺Li____________________Why is water often used as the main ingredient in cosmetics?
Answer:
Water forms the basis of almost every type of cosmetic product, including creams, lotions, makeup, deodorants, shampoos and conditioners. Water plays an important part in the process, often acting as a solvent to dissolve other ingredients and forming emulsions for consistency.
Explanation:
Water forms the basis of almost every type of cosmetic product, including creams, lotions, makeup, deodorants, shampoos and conditioners. Water plays an important part in the process, often acting as a solvent to dissolve other ingredients and forming emulsions for consistency.
A gas occupies 1200 litres at 2 atm pressure. To what pressure must it be compressed to occupy 60 litres at the same temperature?
P2 = 40 atm
Explanation:
Given:
P1 = 2 atm
V1 = 1200 L
V2 = 60 L
P2 = ?
Using Boyle's law and solving for P2,
P1V1 = P2V2
P2 = (V1/V2)P1
= (1200 L/60 L)(2 atm)
= 40 atm
gas a and gas b are allowed to effuse. gas a has a molar mass of 4 g/mol and is 3 times faster than gas b. find the molar mass of gas b.
a. 16
b. 25
c. 36
d. 49
Answer:
Answer a is the best way for gas b
What form of pollution can lichens be a good indicator of?
Answer:
Lichens can be used as air pollution indicators, especially of the concentration of sulphur dioxide in the atmosphere. Lichens are organisms that grow in exposed places such as rocks or tree bark. They need to be very efficient at absorbing water and nutrients to grow there.
Hydrogen gas can be produced using this equilibrium reaction. Which change
would drive this process toward the product side?
C + H20 = CO + H2+ energy
Answer:
A. Removing CO as it forms
Explanation:
The other dude didn't give the correct answer so I just guessed. Your welcome (O v O)
Answer:
A
Explanation:
I have 3 questions that I will need help from you. 1. The weight of a millimeter of (NH4)2 HPO4 is? 2. How many moles of alanine, C3H7NO2 are there in 159g of alanine? And 3. Nitric acid is a very important industrial chemical. 1.612 * 10^10 pounds of it were produced in 1992. If the density of nitric acid is 12.53 pounds/gallon. What volume would be occupied by this quantity. (1 gallon =3.7854liters)
Answer:
1. m(NH₄)₂HPO₄ = 1.62 g
2. molesC₃H₇NO₂ = 1.79 moles
3. V = 4.87x10⁹ L
Explanation:
These questions are pretty easy to solve, using the correct expressions and formula.
1. To do this, we just need the density of the (NH₄)₂HPO₄. In this case, the reported density is 1.62 g/mL, therefore:
d = m/V (1)
Where:
d: density (g(mL)
m: mass of the compound (g)
V: volume of the compound (mL)
As we already have the volume, we can solve for m:
m = d * V (2)
m = 1.62 * 1
m(NH₄)₂HPO₄ = 1.62 g2. To do this, we need the atomic weights of each element that composes the alanine.
C: 12 g/mol; H: 1 g/mol; N: 14 g/mol; O: 16 g/mol
With these atomic weight, let's determine the molar mass of alanine:
MM C₃H₇NO₂ = 3(12) + 7(1) + 14 + 2(16) = 89 g/mol
Now to get the moles, we use the following expression:
moles = m/MM (3)
moles = 159 / 89
molesC₃H₇NO₂ = 1.79 moles3. We have the mass and density of the nitric acid, we just solve for Volume from expression (1) of part 1:
V = m/d (3)
V = 1.612x10¹⁰ pounds / 12.53 pounds/gallons
V = 1.287x10⁹ gallons
Converting this to liters:
V = 1.287x10⁹ * 3.7854
V = 4.87x10⁹ LHope this helps
Calculate the mass defect and the nuclear binding energy of nitrogen-14.
The mass of a proton is 1.00728 amu, and the mass of a neutron is 1.00866 amu.
The mass of a nitrogen-14 atom is 14.00307 amu.
The mass defect of nitrogen-14 is
amu. Round to the decimal place.
The nuclear binding energy of one nitrogen-14 atom is
x 10A J. Round to 3 significant digits.
A:
Answer:
1.62 * 10^-11 J
Explanation:
Nitrogen-14 nucleus has seven neutrons and seven protons. So;
Total mass of protons = 7(1.00728 amu)
Total mass of neutrons = 7(1.00866 amu)
Total mass of nucleons = 7(1.00728 amu) + 7(1.00866 amu)= 14.11158 amu
Mass of Nitrogen-14 nucleus = 14.00307 amu
Mass defect = 14.11158 amu - 14.00307 amu = 0.10851 amu = 1.801852171 * 10^-28 Kg
Binding energy = Δmc^2
Where;
Δm = mass defect
c = speed of light
Binding energy = 1.801852171 * 10^-28 Kg * (3 * 10^8)^2
Binding energy = 1.62 * 10^-11 J
Answer:
0.10851 amu
1.62
-11
Explanation:
Yw
What are the two products of every neutralization reaction?
Group of answer choices
Salt and Water
Acid and Base
Acid and Hydrogen Gas
Acid and Hydroxide
Answer:
Explanation:
c
How many grams of NaNO3 can be dissolved in 200mL of water at 40 degrees Celsius?
Group of answer choices
200 grams
210 grams
100 grams
105 grams
Answer:
I think the answer is, 100.
Explanation:
but i dont know try
When pumping air into a tire, you have to pull back on the pump plunger to fill the pump with air. This increases the volume of the air inside the pump. This increase in volume has what effect on the gases inside the pump?
Question 9 options:
the gas molecules inside the pump are able to spread out more which decreases the pressure of the gas.
the gas molecules inside the pump get compressed and packed closer together which decreases the pressure of the gas.
the gas molecules inside the pump are able to spread out more which increases the pressure of the gas.
the gas molecules inside the pump get compressed and packed closer together which increases the pressure of the gas.
Answer:
Pulling back on the plunger allows you to put in more air into the pump and the more air you have inside a fixed volume, the greater the pressure becomes. (D)
please help me I have no idea what this is
Let's say you eat some food, jump down some stairs, run outside, and then go inside and turn on the lights. Name and describe all the forms of energy and energy transformations that would happen when you do this. You should find at least 4, but try to find more! (1 point for each type of energy)
Answer:Chemical energies,elastic energy,kinetic energy,Light energy :)
Explanation:
25 grams of water is heated from 450C to 850C. What is the delta H?
Explanation:
The heat required to convert 25 grams of -10 °C ice into 150 °C steam is 78360 J or 78.36 kJ.
Explanation:
The heat required to convert 25 grams of -10 degree ice into 150 degree stream is 78360 J or 78.36 K J